You have just installed your Cel-Fi system but you do not see
any more bars on your mobile device. According to the bars on your
handset you are not getting better signal after installing your
Cel-Fi Booster Device.
Even if your Cel-Fi is installed correctly and the service you
experience is substantially improved, your handset may not show
these improvements with higher signal bars.
The easiest way to confirm that the Cel-Fi is working is to
remember what your initial need was. For example, if you had no
coverage in this area before and now you do, or if you were
experiencing dropped calls before and now you are able to hold
calls without an issue, you can say without a doubt that your
handset is getting a better signal thanks to your Cel-Fi Smart
The simple truth is that the number of bars might not always
change. The bars on your handset or tablet can be confusing as they
do not always show raw signal strength, as one might expect. Almost
all mobile manufactures have their own algorithm to calculate
things like signal strength, signal-to-noise ratio, and channel
loading among other things.
Troubleshooting my Signal
Novotech and Cel-fi have created this handy page to help you
troubleshoot the most common issues after a signal booster is
Slow data speeds
Spotty or inconsistent coverage
Watch this video for clarification
on bar signal strength.
Scroll below for instructions on
how to check raw signal strength from an iPhone or Andriod
How to Determine your Signal
iOS 10.3.1 and newer
Select “Serving Cell Meas” signal strength will be displayed as
Select “Serving Cell Meas” signal strenght will be displayed as
iOS versions OLDER than 10.3.1
Hold the Power/Lock button until you see “Slide to power off”.
Do not power off, but release the power button.
Hold the Home button until the phone goes back to your home
screen. At this time you should now see your raw signal strength
instead of bars on the top left of your handset.
To go back to bars, dial *3001#12345#* and tap the home button
to Exit Field Test Mode.
The Signal Indicator will be displayed as RI or RSRP.
Deciphering what RAW Signal Strength
means to you
The raw signal strength can determine if your handset is getting
signal from the Coverage Unit. With the Coverage Unit plugged in,
go to the location of your CU and dial the Field Test Mode Code for
your phone, remember this number. Now unplug your Coverage Unit and
watch your signal strength change, it may take a few minutes for
your phone’s readings to update. Keep in mind, a smaller
the negative number equals stronger signal. For example,
if your signal strength jumps from -111 to -100 your signal is 10
times stronger with Cel-Fi than it was without Cel-Fi.
While the number changes might seem slight, even 3 numbers lower
is 2 times stronger than before. The
cellular scale is not 0 to 100, but the range of usable cellular
LTE signal is -120 (just barely usable) to -60 (about the best you
will find). Here is a simple chart to give you an idea of just how
BIG the “little” improvement really is.
How much stronger
the signal really is
handset’s signal value in dB (with Cel-Fi CU on)